Mirum Pharmaceuticals MIRM Insider Ownership

NASDAQ MIRM

$83.85 -1.22 (-1.44%)

As of: Oct 21, 2026 · 2:24 PM EDT

Insider Holdings by Owner

25.85Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

7.37%

▼-0.012% pp QoQ

Shares Held by Insiders

4.77Mn

filed for Sep 2026

▼-0.16% QoQ

Shares Outstanding

64.75Mn

64,754,699 shares

Direct Holdings

369.92K

Indirect: 4.40Mn

Net Shares Traded (QoQ)

-7.52K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 16, 2026

In the last 12 months, insiders at Mirum Pharmaceuticals made open-market purchases of $9 million (131.43K shares) and open-market sales of $41.53 million (459.39K shares).

By number of insiders, Mirum Pharmaceuticals saw one insider buy and 7 insiders sell on the open market over the past 12 months.
Among Mirum Pharmaceuticals insiders, Patrick J. Heron (Director) led open-market buying over the past 12 months with $9 million of purchases (131.43K shares); the latest was on January 23, 2026.
On the sell side, Christopher Peetz (Chief Executive Officer) led open-market sales of Mirum Pharmaceuticals stock over the past 12 months with $16.29 million (164.02K shares), most recently on September 1, 2026.
Eric Bjerkholt (Chief Financial Officer) made the most recent open-market trade by an insider of Mirum Pharmaceuticals, a sale of 9.94K shares for $978,093 on September 14, 2026.
Away from the open market, MIRM insiders acquired 571.67K shares through option exercises and conversions and gave away 21.07K shares as gifts over the last 12 months.
According to Business Quant data, insiders at Mirum Pharmaceuticals reported 4.78Mn shares in total in their latest Form 4 filings, or 7.38% of the 64.75Mn shares outstanding; that total is up 0.10% from 4.78Mn shares at the end of Q2 2026 and up 6.19% from 4.5Mn shares at the end of Q3 2025.
By type of ownership, MIRM insiders hold 7.99% of their shares directly (382.12K shares) and 92.01% indirectly (4.4Mn shares).
Business Quant counts 12 insiders with holdings in Mirum Pharmaceuticals stock, among the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Mirum Pharmaceuticals' top three insider holders by shares held are Patrick J. Heron (Director, 4.03Mn shares), Christopher Peetz (Chief Executive Officer, 394.14K shares) and Michael G. Grey (Director, 186.41K shares).
The holding of Patrick J. Heron makes up 84.31% of all shares held by Mirum Pharmaceuticals insiders.
In the past year, 14 insiders of Mirum Pharmaceuticals submitted 65 Form 4 filings reporting trades, awards or other transactions.
The insider holdings and trades above for Mirum Pharmaceuticals reflect Form 4 filings through October 12, 2026.

Form 4 Holdings

Insiders Holding MIRM

Insiders 26

Shares held 25.85Mn

Of outstanding 39.92%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	James E Flynn	TenPercentOwner, Other	0	3,244,434	3,244,434	12.6%	08 Jun, 2022
2	Scott D Sandell	TenPercentOwner	0	2,199,372	2,199,372	8.5%	15 Jun, 2023
3	Anthony A. Jr. Florence	TenPercentOwner	384	2,197,591	2,197,975	8.5%	15 Jun, 2023
4	Mohamad Makhzoumi	TenPercentOwner	0	2,197,744	2,197,744	8.5%	15 Jun, 2023
5	Forest Baskett	TenPercentOwner	0	2,187,791	2,187,791	8.5%	15 Jun, 2023
6	Carmen Chang	TenPercentOwner	135	2,186,243	2,186,378	8.5%	15 Jun, 2023
7	Ali Behbahani	TenPercentOwner	0	2,186,378	2,186,378	8.5%	15 Jun, 2023
8	Paul Edward Walker	TenPercentOwner	0	2,186,357	2,186,357	8.5%	15 Jun, 2023
9	Partners 16, L.P. Nea	TenPercentOwner	0	2,186,243	2,186,243	8.5%	15 Jun, 2023
10	Enterprise Associates 16, L.P. New	TenPercentOwner	2,186,243	0	2,186,243	8.5%	15 Jun, 2023
11	Niall O'Donnell	Director	0	1,621,118	1,621,118	6.3%	15 Nov, 2022
12	Patrick J Heron	Director	0	459,010	459,010	1.8%	27 Jan, 2026
13	Christopher Peetz	Chief Executive Officer	276,164	0	276,164	1.1%	06 Oct, 2026
14	Michael G Grey	Executive Chairman	0	186,410	186,410	0.7%	01 Oct, 2024
15	Lara Longpre	Chief Development Officer	104,407	0	104,407	0.4%	05 Feb, 2024
16	Peter Radovich	President And Coo	57,260	0	57,260	0.2%	08 Jun, 2026
17	Eric Bjerkholt	Chief Financial Officer	44,745	0	44,745	0.2%	15 Sep, 2026
18	Ian Clements	Chief Financial Officer	30,011	0	30,011	0.1%	14 Nov, 2022
19	Pamela Vig	Chief Scientific Officer	27,406	0	27,406	0.1%	25 Jun, 2024
20	Joanne Quan	Chief Medical Officer	18,864	0	18,864	0.1%	17 Mar, 2026
21	Jolanda Howe	Svp, Global Controller	16,728	0	16,728	0.1%	19 Oct, 2026
22	Laura Brege	Director	15,703	0	15,703	0.1%	12 Sep, 2025
23	Laurent Fischer	Director	10,727	0	10,727	0.0%	02 Jun, 2026
24	Timothy P Walbert	Director	9,680	0	9,680	0.0%	02 Jun, 2026
25	Lon Cardon	Director	9,680	0	9,680	0.0%	02 Jun, 2026
26	William Fairey	Director	2,500	0	2,500	0.0%	12 Jun, 2025

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

668 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
16 Oct, 2026	Jolanda Howe	Svp, Global Controller	Acquired M	16,112	$19.24	$309.99K	16,728	Direct
16 Oct, 2026	Jolanda Howe	Svp, Global Controller	Disposed M	16,112	$0.00	$0	8,888	Direct
09 Oct, 2026	Robert Paul Myers	Chief Medical Officer	Acquired A	40,000	$0.00	$0	40,000	Direct
09 Oct, 2026	Robert Paul Myers	Chief Medical Officer	Acquired A	25,000	$0.00	$0	25,000	Direct
06 Oct, 2026	Christopher Peetz	Chief Executive Officer	Acquired M	5,305	$19.19	$101.80K	199,745	Direct
06 Oct, 2026	Christopher Peetz	Chief Executive Officer	Acquired M	6,892	$15.87	$109.38K	206,637	Direct
06 Oct, 2026	Christopher Peetz	Chief Executive Officer	Disposed M	5,305	$0.00	$0	169,695	Direct
06 Oct, 2026	Christopher Peetz	Chief Executive Officer	Disposed M	6,892	$0.00	$0	233,108	Direct
11 Sep, 2026	Eric Bjerkholt	Chief Financial Officer	Acquired M	18,333	—	—	54,688	Direct
14 Sep, 2026	Eric Bjerkholt	Chief Financial Officer	Disposed S	9,943	$98.37	$978.09K	44,745	Direct
11 Sep, 2026	Eric Bjerkholt	Chief Financial Officer	Disposed M	18,333	$0.00	$0	0	Direct
02 Sep, 2026	Jolanda Howe	Svp, Global Controller	Disposed S	658	$100.00	$65.80K	616	Direct
01 Sep, 2026	Christopher Peetz	Chief Executive Officer	Acquired M	30,000	$2.94	$88.08K	224,440	Direct
01 Sep, 2026	Christopher Peetz	Chief Executive Officer	Disposed S	8,312	$98.08	$815.24K	216,128	Direct
01 Sep, 2026	Christopher Peetz	Chief Executive Officer	Disposed S	21,688	$98.91	$2.15Mn	194,440	Direct
01 Sep, 2026	Christopher Peetz	Chief Executive Officer	Disposed M	30,000	$0.00	$0	58,487	Direct
18 Aug, 2026	Jolanda Howe	Svp, Global Controller	Acquired M	40,000	$6.27	$250.80K	41,274	Direct
18 Aug, 2026	Jolanda Howe	Svp, Global Controller	Disposed S	40,000	$100.00	$4.00Mn	1,274	Direct
18 Aug, 2026	Jolanda Howe	Svp, Global Controller	Disposed M	40,000	$0.00	$0	0	Direct
11 Aug, 2026	Eric Bjerkholt	Chief Financial Officer	Disposed S	6,001	$99.90	$599.51K	36,355	Direct

Showing 1 to 20 of 668 transactions